The history tab appears in the options tab under LocalData. 

If it didn't work, find the .mdb file like SAP_local*.mdb, the path of which should be available in the options tab under LocalData (Directory of local data).

It is always possible to delete the file, so that when the SAP frontend is restarted, it creates the file again and history is back again.

Please make sure to uncheck the enable low speed connection as the history won't work if this was enabled.

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